Twitshift lets you relive the glory days of a year ago

A developer named James Wheare has built a Twitter app called Twitshift, which lets you re-run
the best of @you.

The app sucks up all the content published in your Twitter account over the last year and posts it up on a new
Twitter account exactly a year after it was originally published.
The idea is to remind yourself of where you were a year ago -- what
your worries, triumphs and embarrassments were, and how little they
likely matter today.

It's a little bit fiddly to set up -- you'll spend plenty of
time logging in and out of different accounts, and you'll need a
spare email address. It's only able to cope with the last 3,200 of
your tweets, due to a Twitter API limitation. That
shouldn't be a problem for you unless you post an average of more
than 8.8 tweets per day. It comes complete with a button to click
to turn your Twitter userpic sepia.

Also, if you don't want to annoy people with utterly irrelevant
@replies from a year ago then you'll want to set the feed as
protected, which stops others viewing it unless you grant them
specific permission. A nice feature addition would be a check box
to exclude any @replies from being posted.

Once you're set up though, it's a great reminder of news
stories, memes and links that you'd utterly forgotten about,
standing as an antidote to the ephemeral "here today, gone
tomorrow" nature of social media.

But of course, as Futurismic points out, "the problem with looking
back over one's shoulder is that it increases the likelihood of one
walking into a lamppost".